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Quantum damping of Fermi-Pasta-Ulam revivals in ultracold Bose gases

We propose an experimental scheme for studying the Fermi-Pasta-Ulam (FPU) phenomenon in a quantum mechanical regime using ultracold atoms. Specifically, we suggest and analyze a setup of one-dimensional Bose gases confined into an optical lattice. The strength of quantum fluctuations is controlled by tuning the number of atoms per lattice sites (filling factor). By simulating the real-time dynamics of the Bose-Hubbard model by means of the exact numerical method of time-evolving block decimation, we investigate the effects of quantum fluctuations on the FPU recurrence and show that strong quantum fluctuations cause significant damping of the FPU oscillation.

preprint2010arXivOpen access
Ippei DanshitaRafael HipolitoVadim OganesyanAnatoli Polkovnikov
cond-mat.quant-gas
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Ippei DanshitaRafael HipolitoVadim OganesyanAnatoli Polkovnikov

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